*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            background: #f7f9fc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0;
            margin: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus-visible {
            color: #1d4ed8;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin: 0.4rem 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: #0f172a;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.5rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.4rem;
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.35rem;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1.5rem;
            font-weight: 600;
        }
        p {
            margin: 1rem 0;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .skip-link {
            position: absolute;
            top: -100%;
            left: 1rem;
            background: #2563eb;
            color: #fff;
            padding: 0.6rem 1.2rem;
            border-radius: 0 0 8px 8px;
            z-index: 1000;
            font-weight: 600;
        }
        .skip-link:focus {
            top: 0;
        }
        .site-header {
            background: #ffffff;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(6px);
            background: rgba(255, 255, 255, 0.96);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 800;
            background: linear-gradient(135deg, #2563eb, #7c3aed);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.03em;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #2563eb;
            font-size: 1.5rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .main-nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .main-nav a {
            padding: 0.5rem 0.9rem;
            border-radius: 8px;
            font-weight: 500;
            font-size: 0.92rem;
            color: #1e293b;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            background: #eef2ff;
            color: #2563eb;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: #1e293b;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #f1f5f9;
        }
        .breadcrumb {
            background: #f1f5f9;
            padding: 0.6rem 0;
            font-size: 0.88rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #94a3b8;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #475569;
        }
        .breadcrumb a:hover {
            color: #2563eb;
        }
        .breadcrumb .current {
            color: #0f172a;
            font-weight: 600;
        }
        main {
            flex: 1;
            padding: 2rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media (max-width: 900px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body {
            background: #fff;
            border-radius: 16px;
            padding: 2rem 2.2rem;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
        }
        .article-body p,
        .article-body li {
            font-size: 1.04rem;
            color: #1e293b;
        }
        .article-body p {
            margin: 1.25rem 0;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.8rem;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 14px;
            padding: 1.5rem 1.4rem;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
            border: 1px solid #f1f5f9;
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            margin-top: 0;
            margin-bottom: 0.8rem;
            border-bottom: 1px solid #e2e8f0;
            padding-bottom: 0.5rem;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card li {
            margin: 0.5rem 0;
        }
        .sidebar-card a {
            display: block;
            padding: 0.3rem 0;
            font-size: 0.95rem;
            border-bottom: 1px solid #f1f5f9;
        }
        .sidebar-card a i {
            margin-right: 0.5rem;
            color: #2563eb;
            width: 1.1rem;
        }
        .featured-image-wrap {
            margin: 2rem 0 1.5rem;
            border-radius: 14px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .featured-image-wrap img {
            width: 100%;
            max-height: 460px;
            object-fit: cover;
        }
        .image-caption {
            font-size: 0.85rem;
            color: #64748b;
            text-align: center;
            padding: 0.6rem 0 0.2rem;
            font-style: italic;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1.5rem 0 2rem;
            max-width: 520px;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 40px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.25s;
            background: #fff;
        }
        .search-form input[type="text"]:focus {
            border-color: #2563eb;
        }
        .search-form button {
            background: #2563eb;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.7rem 1.5rem;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #1d4ed8;
            transform: scale(1.02);
        }
        .feedback-forms {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0 1rem;
            padding: 1.8rem 0;
            border-top: 2px solid #e2e8f0;
        }
        @media (max-width: 680px) {
            .feedback-forms {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .feedback-forms form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-forms label {
            font-weight: 600;
            font-size: 0.95rem;
        }
        .feedback-forms input,
        .feedback-forms textarea,
        .feedback-forms select {
            padding: 0.65rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border-color 0.2s;
            background: #fff;
        }
        .feedback-forms input:focus,
        .feedback-forms textarea:focus,
        .feedback-forms select:focus {
            border-color: #2563eb;
            outline: none;
        }
        .feedback-forms textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-forms .btn-submit {
            background: #0f172a;
            color: #fff;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-forms .btn-submit:hover {
            background: #1e293b;
            transform: scale(1.02);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.6rem;
            color: #d1d5db;
            cursor: pointer;
        }
        .rating-stars i {
            transition: color 0.2s, transform 0.1s;
        }
        .rating-stars i:hover,
        .rating-stars i.active {
            color: #f59e0b;
            transform: scale(1.1);
        }
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
            border-top: 4px solid #1e293b;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 720px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .footer-inner h4 {
            color: #f8fafc;
            margin-top: 0;
            font-size: 1.1rem;
            border-bottom: 1px solid #334155;
            padding-bottom: 0.5rem;
        }
        .footer-inner a {
            color: #94a3b8;
        }
        .footer-inner a:hover {
            color: #ffffff;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.5rem 0.2rem 0;
            padding: 0.2rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: 1.8rem;
            margin-top: 1.8rem;
            border-top: 1px solid #1e293b;
            font-size: 0.88rem;
            color: #94a3b8;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: inline-block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 0.6rem 0 1rem;
                border-top: 1px solid #e2e8f0;
                margin-top: 0.5rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 0.8rem;
                border-radius: 0;
                border-bottom: 1px solid #f1f5f9;
            }
            .header-inner {
                padding: 0.6rem 0;
            }
            .article-body {
                padding: 1.2rem 1rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .feedback-forms {
                padding: 1.2rem 0;
            }
            .search-form {
                flex-direction: column;
                max-width: 100%;
            }
            .search-form button {
                justify-content: center;
            }
        }
        @media (max-width: 480px) {
            .my-logo {
                font-size: 1.3rem;
            }
            .container {
                padding: 0 0.9rem;
            }
            .sidebar-card {
                padding: 1rem;
            }
        }
        .text-muted {
            color: #64748b;
            font-size: 0.92rem;
        }
        .last-updated {
            display: inline-block;
            background: #eef2ff;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #4338ca;
            font-weight: 500;
        }
        .highlight-box {
            background: #f8fafc;
            border-left: 4px solid #2563eb;
            padding: 1.2rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .highlight-box p {
            margin: 0.3rem 0;
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #0f172a;
            color: #fff;
            width: 46px;
            height: 46px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
            transition: transform 0.2s, background 0.2s;
            border: none;
            cursor: pointer;
            z-index: 50;
        }
        .btn-top:hover {
            background: #2563eb;
            transform: translateY(-4px);
        }
        @media print {
            .site-header,
            .site-footer,
            .sidebar,
            .search-form,
            .feedback-forms,
            .btn-top,
            .hamburger {
                display: none !important;
            }
            .content-grid {
                display: block;
            }
            .article-body {
                box-shadow: none;
                padding: 0;
            }
            body {
                background: #fff;
                color: #000;
            }
            h1,
            h2,
            h3,
            h4 {
                color: #000;
            }
            a {
                color: #000;
                text-decoration: underline;
            }
        }